Dimensions of the labyrinth correlated

In a paper entitled “ The Typical Form of the Cochlea and its Variations ” (‘Roy. Soc. Proc.,’ B, 1916, vol. 89, pp. 410-421), I displayed a series of correlations that were based upon Dr. A. A. Gray’s measurements of the cochleas of a large number of different species of animals. I took no regard of the measurements he had also given for the other parts of the labyrinth, especially for the semi-circular canals. But it seems a pity to abandon the work involved in the study of the cochlea without setting it into relation to the rest of Dr. Gray’s data. There is no such obvious variation in the structure of the canals as there is in the number of whorls of the cochlea. Their regularity of structure might well be assumed from a general impression of them. Nevertheless, it is more satisfactory to know definitely by statistical means whether they do really agree so closely with one another as they seem to. For these reasons I now present the results of my study of these measurements of the rest of the labyrinth. These measurements concern the internal and external diameters of the semi-circular canals (“ respectively, the distance between concave margin of one limb and concave margin of the other limb, and between convex margin of one limb and convex margin of the other limb ”), the extreme length of the labyrinth (“the distance from the vertex of the posterior canal to the innermost point on the lowest whorl of the cochlea ”), the longest diameter of the vestibule, the height of the canals, the diameter of the tube at the vertex of the canals (which “ terms explain themselves ”) and with the measurements of the cochlea given in the earlier paper.